7020721 has 8 divisors (see below), whose sum is σ = 7154784. Its totient is φ = 6888000.

The previous prime is 7020707. The next prime is 7020737. The reversal of 7020721 is 1270207.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7020721 - 2⁷ = 7020593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7020701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20665 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (894348).

Almost surely, 2^7020721 is an apocalyptic number.

It is an amenable number.

7020721 is a deficient number, since it is larger than the sum of its proper divisors (134063).

7020721 is a wasteful number, since it uses less digits than its factorization.

7020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 7020721 is about 2649.6643183619. The cubic root of 7020721 is about 191.4816839915.

Adding to 7020721 its reverse (1270207), we get a palindrome (8290928).

The spelling of 7020721 in words is "seven million, twenty thousand, seven hundred twenty-one".